68 ■ BIRDS OF COLORADO. 



it occurs over all of North America, it will probably yet be 

 taken on tbe prairies of western Colorado. Arrives about tbe 

 first of May and breeds far north. 

 [266. Numenlus borealis. Eskimo CurlSw. 



Migratory; rare. There is no reason to doubt that of the enormous 

 flocks of this Curlew that pass over western Kansas, some occasionally enter 

 Colorado ; but to date there is no certain record of its capture in the State. It 

 has been previously listed as a Colorado bird, but the record was based on error.] 



270. Squatarola squatarola. Black-bellied Plover. 



Migratory ; not common. Passes north through Colorado 

 in May and returns in October. More common in fall than in 

 spring. It is a bird of the plains below 5,000 feet. There are 

 eight recorded instances of its capture at. Denver, Loveland and 

 Fort Collins, and Mr. C. E. Aiken has taken it several times 

 near Colorado Springs. Breeds far north. 



272. Charadrius dominicus. American Golden Plover. 

 Migratory ; not common. A few pass in the spring and fall 

 over the plains region of Colorado below 5,000 feet. Breeds far 

 north. 



273- ffgialitis vocifera. Killdeer. 



Summer resident ; abundant. One of the earliest migrants, 

 arriving early in March and remaining until the last of Septem- 

 ber and a few much later. Breeds abundantly on the plains 

 and at the base of the foothills. Is less common in the mount- 

 ains, but is far from scarce up to the pines at about 10,000 feet. 

 The eggs are laid from the middle of May to the first of June. 



274. Agialitis semipalmata. Semipalmated Plover. 



Migratory; not common. Passes through Colorado on its 

 way from its breeding grounds near the Arctic Circle to its 

 winter habitation which is sometimes far south of the equator. 

 One was shot by Harry Smith at Loveland, May 6, 1890, and the 

 specimen is now in the collection of Prof. Wm. Osburn. This 

 is the only record to date fo^ Colorado. 



281. Agialitis montana. Mountain Plover. 



Summer resident; common. A bird of the plains rather than 

 the mountains, but also found in the mountain parks and prai- 

 ries up to 8,000 and rarely to 9,000 feet. Is among the earliest 

 spring arrivals, reaching central Colorado by the last of March 

 to the first week in April. Eggs are laid the latter part of May 

 to the middle of June. On the plains the young are hatched by 

 the last of June; in the mountain parks newly hatched young 

 can be found all through July. Breeds throughout its range. 

 Leaves the state in the fall, the latter part of October. Its num- 

 ber can be judged by the fact that in one day of August at Fort 

 Lyon, Capt. Thorne shot one hundred and twenty-six birds. 



